8. HYPOPACHUS. 159 
sclerotica ossified, so as to form a hard annulus round the cornea. 
Tympanum concealed. Fingers and toes free. Precoracoids pre- 
sent ; no omosternum; sternum cartilaginous, much dilated, and 
entirely in contact with the coracoids. 
Brazil. 
1. Stereocyclops incrassatus. 
Stereocyclops incrassatus, Cope, J. c. 
Physiognomy approaching Pipa. Gape large, the muzzle pro- 
jecting slightly beyond it. Limbs short, humerus and femur in- 
cluded in the skin. Toes very unequal, the inner and outer very 
short. An obtuse tubercle at the base of the outer toe. Epidermis 
everywhere thickened by a chitin-like deposit. Colour everywhere 
leather-brown ; a narrow white line from end of muzzle to vent. 
Sao Matheos, south of Rio Janeiro. 
8. HYPOPACHUS*. 
Hypopachus, Keferst. Gotting. Nachr. 1867, p. 352. 
Engystoma, sp., Cope, Proc. Ac. Philad. 1866, p. 131. 
Systoma, sp., Cope, Jow'n, Ac. Philad. (2) vi. 1867, p. 194. - 
Pupil erect. Tongue elliptic, entire, free behind. Vomerine 
teeth none. A dermal ridge across the palate between the choane, 
and another in front of the cesophagus. Tympanum hidden. 
Fingers free; toes with a rudiment of web, the tips not dilated. 
Outer metatarsals united. Precoracoids present, very weak; no 
omosternum ; sternum cartilaginous. Diapophyses of sacral ver- 
tebra moderately dilated. Terminal phalanges simple. 
Tropical America. 
1. Hypopachus variolosus. 
Engystoma variolosum, Cope, Proc. Ac. Philad. 1866, p. 131, and 
Proc. Amer, Philos. Soc, 1869, p. 166; Brocchi, Bull, Soc. Philom. 
(7) i. p. 192. 
Hypopachus seebachii, Keferst. Gotting. 1. c., and Arch. f. Naturg. 
1868, p. 293, pl. 9. £1 & 2. 
Systoma variolosum, Cope, Journ. Ac. Philad. (2) vi. 1867, p. 194. 
Hypopachus variolosus, Cope, Jowrn. Ac. Philad, (2) viii. part il. 
p. 101; Brocchi, Miss. Sc. Mex., Batr. pl. 10. f. 2. 
Snout short, subacuminate, moderately prominent, once and a 
half the diameter of the eye. Fore limb much longer than its 
distance from the tip of the snout; fingers moderately elongate. 
Hind limb stout; it being carried forwards along the body, the 
tibio-tarsal articulation reaches the shoulder, or nearly as far; toes 
* Copea fulva, Steindachn. Verh. zool.-bot. Ges, Wien, 1864, p. 286, pl. xvii. 
f. 5, belongs perhaps to this genus. Had. Brazil. 
